Jack-knife



B. A. PRINCE.

JACK KNIFE.

APPLICATION FILED 0502,1919.

Patented Mar. 8, 1921.

2 SHEETSSHEET l.

B. A. PRINCE.

JACK KNIFE.

APPLICAHON FILED 0502,1919.

Patented Mar. 8, 1921.

2 SHEETS--SHEET 2.

FICA? F1614- IHVENTORI,

MMa-a BURTON A. PRINCE, OF WESTFIELD, MASSACHIl'SETTS;

- JACK-KNIFE.

Specification of Letters Patent.

. Patented Mar. 8, 1921.

Application filed December 2, 1919. Serial No. 342,026. 1

T 0 aZZ whom it may concern:

Be it known that I, BURTON A. PRINCE, a citizen of the United States of America, residing at \Vestfield, in the county of Hampden and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Jack-Knives, of which the following is a specification.

This invention relates to improvements in knives, commonly known as pocket jack knives. The object of the invention is to provide a knifein which the blades are readily interchangeable, so that different shapes can be used or substituted in the same handle when the blades are worn out, broken, or it is desired to change them for any reason.

Another object of the invention is to provide a knife in which there are no sharp edges on the handle that would endanger the user of same. Another object is to provide a knife in which the blade, instead of being pivotally attached to the handle is slidable in and out of the handle, thereby preventing the possibility of theblade accidentally turning on its pivot.

In the present invention there are no springs engaging the blades to wear out or become broken and one that can be easily opened without using the finger nail as in the ordinary knife.

The invention broadly considered, comprises a handle formed with a casing or blade sheath located therein for receiving theblade and a lock of suitable construction for holding the blade in place when pushed into the handle or extended for use.

Referring to the drawings:

Figure 1 is a side elevational view of one form of my improvement showing the blade extended and in locked position ready for use.

Fig. 2 is a side elevational view of Fig. 1 showing the blade incased or pushed into the handle.

Fig. 3 is a vertical sectional view through the handle illustrating the interior construction and the sheath therein, the view being taken in the plane of the side of the blade.

Fig. 4 is a longitudinal sectional view on the line 44 of Fig. 3, showing one form of lock for the blade.

F i9. 5 is a transverse sectional view on the line A of Fig. 4, showing the two parts of the handle and the inclosing casing or sheath.

Fig. 6 is a sectional view through the pivot the lock on the line 66 of Fig. 4.

Fig. 7 is a side elevational view of" Fig. 6. Fig. 8 illustrates a blade of different shape or formation from that shown in Figs. 1 and 3.

Figs. 9 to 14 show modifications of the locking device and in which;

Fig. 9 is a sectional view through the handle taken in a plane. parallel with the side of the blade.

Fig. 10 is a side elevational view of'Fig. 9 showing the blade in dotted lines inserted in the handle.

Fig. 11 is a View similar to Fig. 9, but showing a different form of lock for the blade."

Fig. 12 is a horizontal sectional View taken a plane on the line 12-12 of Fig. 11. Fig. 13 is a view of a modification in which the lock is located at one side of the blade. l3Fig. 14 is a side elevational view of Fig. Fig. 15 is a transverse sectional view on the line BB of F ig. 11 showing the lock holding the blade in open position.

Referring to the drawings in detail: 1 designates the blade in the several views; 2 is the handle proper; 3 and 4 are the ferrules at the opposite ends of the handle; 5 designates the sheath that is located within the handle and is a rectangular construction to receive the blade. 6 designates one form of lock which is provided with a curved edge 6 and a flat surface 6 the curved edge entering the opening 5 to hold the blade locked and in either open or closed position. When it is desired to push theblade into the sheath, the lock 6 is rotated on its pivot to bring the fiat surface 6 against the side of the blade. 8 and 9 are rivets passing through the ferrules, the sheath and the wooden portions or side pieces of the handle.

10 designates the pivot pin for the lock 6.

l1 and 12 are the wooden portions of the handle within which the sheath 5 is secured by means of the rivets just referred to. For pivotally securing the lock 6 to the sheath, brackets 13 and 14 are provided in which the pin 10 is located, as clearly shown in Figs. 6 and 7.

Referring to Figs. 10, 9, 13, 14. and 15, in

which modifications of the locking device are shown, in Figs. 9 and 10, 16 designates a pin or stop to prevent the knife blade from being pushed inwardtoo far when :in'or out of use. When the'blade is not in use, t is in the position shown in Fig. 10, the lock being held in place by means of the spring 17, which look is designated at 18 and pivotally secured to the casing at 18, the-end 18 entering a recess in the edge of the blade, whereby the blade is prevented from being withdrawn. By pressing inward on the part- 18, its end 18 iswithdrawnaml the blade can be readily removed.

in the side of the handle which is similar to the lock shown in Figs. 9 and 10.

An opening in the side of the blade receives the end 18?. r 7

From this description it will be seen that the various constructions permit the blade to be readily removedtrom thehandle and inserted therein ready for use where it is aaitomatically locked and retained in this V venting the blade 7 inward or'outward when in use.

position,'the different locking devices pre- 7 "It is evident that blades of difi'erent forms may b V used as shown in Figs. 1', 3 and 8. i

What I claim is: 1. In a jackfiknife, the combination with the handle thereof, of a centrally disposed.

sheath or casing located in the body portion of the handle and open only at" its end,

from rotating or pushing means for securing the sheath to the handle,

a'blade longitudinally slidable in the sheath and said sheath being designed to receive a blade either in its open or extended positlon and a lock permanently located at the for lward end only of the handle andmovable transversely to the side or plane of the blade for securing the blade in the sheath in both of said positions. r v

V 2. A knife of the type described, in combination with the handle, of an open ended sheath therein and extending substantially the length thereof, a longitudinally movable blade in the sheath, said sheath and handle having an opening in one side thereof for receiving a blade' locking device, said device being arranged for movement in a direction transversely toward and away'from the side of the blade, said device engaging the blade for retaining the same in the sheath when not in use and for holding the blade extended when 1n use. 7

' 8. A jack knife comprising a handle portion, a sheath inca'sed bythe handle and having one end only open to receive a slidable blade, means for locking the blade in either its open or extended position comprising a disk-shaped member having a.

movement transversely toward and away from the slde of the blade, sald member being mounted on a:p1vot and having one edge cut away to "permit the blade to move into the handle and the remaining and out of portion formed on an arc to engage the side oi the blade for clamping it in place in either its open or closed position, as described.

BURTON A. neuron. 

